1 If you use the userProject parameter or the
x-goog-user-project header in your request, you must have
serviceusage.services.use permission for the project ID that you specify,
in addition to the normal Cloud IAM permissions required to make the
request.

2 This permission is only required if you want to include ACLs
or Cloud IAM policies as part of a full projection. If you don't have
this permission and request a full projection, you receive only a partial
projection.

3 This permission is only required if you want to include ACLs
or Cloud IAM policies as part of the response.

4 This permission is only required when the inserted object
has the same name as an object that already exists in the bucket.

5 This permission is required if you want to include ACLs
or Cloud IAM policies as part of the request.